Meditation and Stress Hormones: What Happens to Cortisol When You Meditate?

Your cortisol level is not a verdict on your character. It is a signal—one that meditation appears to influence, though the science is more specific and more conditional than the wellness industry admits. The question is not simply whether meditation lowers cortisol, but when, for whom, and by how much.

The Meta-Analytic Verdict: A Real but Conditional Effect

The most comprehensive answer comes from a 2017 systematic review and meta-analysis published in the Journal of Psychiatric Research, indexed in PubMed. Pascoe and colleagues analyzed 45 randomized controlled trials comparing meditation interventions with active controls. When all meditation forms were analyzed together, meditation significantly reduced cortisol, along with C-reactive protein, blood pressure, heart rate, triglycerides, and tumor necrosis factor-alpha .

But the details matter. The reduction in cortisol was driven specifically by focused attention meditation—practices that involve sustaining attention on a chosen object, such as the breath, and returning to it when the mind wanders. Open monitoring meditation reduced heart rate but not cortisol in this analysis. The researchers concluded that “meditation practice leads to decreased physiological markers of stress in a range of populations” .

“When all meditation forms were analysed together, meditation reduced cortisol, C-reactive protein, blood pressure, heart rate, triglycerides and tumour necrosis factor-alpha.” — Pascoe et al., Journal of Psychiatric Research (2017)

A separate meta-analysis by Koncz and colleagues, published in Health Psychology Review in 2021, focused specifically on cortisol and reached a compatible conclusion: meditation interventions efficiently reduce cortisol levels in at-risk samples . The qualifier is important. The effect is most reliable in populations already experiencing elevated stress, not necessarily in healthy people with normal cortisol rhythms.

The Workplace Evidence: Daytime Slopes, Not Single Points

A 2018 meta-analysis of workplace-based mindfulness programs, published in the Journal of Psychosomatic Research, offers a more granular picture. Across nine studies of employee samples, mindfulness-based interventions were effective in reducing cortisol production—but specifically as indicated by lowered diurnal cortisol slopes. No significant changes were found for the cortisol awakening response or for single morning and evening time-points .

This distinction is technically important. Cortisol follows a daily rhythm: it peaks shortly after waking and declines over the day. A flattened slope—less decline across the day—is associated with chronic stress and poorer health outcomes. The finding that meditation improves the slope rather than single measurements suggests it may help regulate the pattern of cortisol secretion, not simply suppress the hormone at any given moment.

“MBIs were found to be effective in reducing cortisol production, as indicated by lowered high and low diurnal cortisol slopes.” — Heckenberg et al., Journal of Psychosomatic Research (2018)

The same meta-analysis found improvements in heart rate variability coherence and reductions in salivary alpha amylase, a marker of sympathetic nervous system activity. The picture that emerges is not of a single hormone being “lowered” but of a stress system being regulated more efficiently.

The Mechanism: Turning Down the Sympathetic Response

Harvard Health Publishing offers a clear physiological description. Meditation “appears to produce changes in brain activity” and can lower heart rate, blood pressure, breathing rate, oxygen consumption, adrenaline levels, and cortisol. The mechanism involves turning down the sympathetic nervous system—the fight-or-flight branch—and turning up the parasympathetic nervous system, which quiets the body and returns physiological functions to baseline .

Mayo Clinic states this more simply: mindfulness calms the nervous system, and this can reduce cortisol levels . The clinic lists stress reduction as the first benefit of mindfulness meditation, noting that even ten minutes of practice can produce positive effects.

This is consistent with the broader literature on the relaxation response, first described by Harvard’s Dr. Herbert Benson. Meditation triggers a physiological shift opposite to the stress response: heart rate drops, respiratory rate drops, and the body shifts toward repair and recovery .

What the Science Does Not Say

The evidence does not support the claim that meditation “cures” high cortisol or replaces medical treatment for stress-related conditions. The effect sizes in the meta-analyses are modest. The Pascoe review found significant reductions when all meditation forms were pooled, but the heterogeneity across studies was substantial . The workplace meta-analysis included only nine studies, and the authors called their findings “promising” rather than definitive .

There is also the question of dose and experience. An early study of Transcendental Meditation, published in 1978, found that cortisol decreased significantly during meditation only in long-term practitioners with three to five years of practice—not in short-term practitioners after three to four months . This is a single small study from decades ago, but it raises a question the modern literature has not fully resolved: how much practice is needed before cortisol effects become reliable?

The 2021 Koncz meta-analysis suggests the answer may depend on the population. In at-risk samples—people already under significant stress—the effects are more consistent . In healthy people with normal cortisol rhythms, the changes may be smaller or harder to detect.

The Ancient Frame: Why Cortisol Is Not the Point

The Indian contemplative traditions did not measure cortisol. They described a mind that grips its stories and a practice for loosening that grip. The Yoga Sutras of Patanjali define yoga as the stilling of the modifications of the mind (Yoga Sutras 1.2). The goal was not a lower stress hormone. It was moksha—liberation from the cycle of suffering.

From this perspective, cortisol is a downstream marker. When the mind is less reactive, the body’s stress response is less triggered. The hormonal change is a consequence, not the aim. The Bhagavad Gita describes the practitioner who is “ever engaged in the yoga of meditation,” controlling speech, body, and mind (Gita 18.52). The emphasis is on continuity of practice, not on achieving a specific laboratory value.

“Yoga is the cessation of the modifications of the mind.” — Patanjali’s Yoga Sutras 1.2

This does not diminish the scientific findings. It contextualizes them. A lower cortisol slope is a good thing. But it is not the whole of what meditation is for, and treating it as the primary outcome risks reducing a transformative practice to a biological tuning knob.

A Practical Note on Starting

Mayo Clinic suggests that even brief mindfulness practice can be beneficial for stress reduction . Harvard’s Dr. Benson advised at least ten minutes a day to achieve physiological effects . The research on cortisol specifically suggests that focused attention practices—breath awareness, mantra repetition—may be more directly linked to hormonal changes than open monitoring practices .

The honest starting point: ten minutes of breath-focused attention, daily, for several weeks. The cortisol effects may be subtle. The changes in how you respond to stress may be more noticeable than any lab value. That, too, is a form of evidence.

Medical Disclaimer: This article is for informational and educational purposes only and does not constitute medical advice, diagnosis, or treatment. Meditation is not a substitute for professional mental health care or medical treatment for stress-related conditions. If you are experiencing symptoms of chronic stress, anxiety, or any other medical condition, consult a qualified healthcare provider. Research on meditation’s effects on cortisol is ongoing, and individual results vary. Do not disregard professional medical advice or delay seeking it because of something you have read in this article.